[Snyk] Security upgrade node from 12 to 20.5

[RobinM-code]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• apps/platform/Dockerfile

We recommend upgrading to node:20.5, as this image has only 145 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	Directory Traversal SNYK-DEBIAN9-DPKG-2847943	No Known Exploit
	514	NULL Pointer Dereference SNYK-DEBIAN9-IMAGEMAGICK-2403736	No Known Exploit
	614	Buffer Overflow SNYK-DEBIAN9-IMAGEMAGICK-2812517	No Known Exploit
	514	Integer Overflow or Wraparound SNYK-DEBIAN9-LIBXML2-2806806	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN9-OPENSSL-2807589	No Known Exploit

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